HD4032 Digital LED ON/OFF temperature regulator 48x78, Pt100 sensor.
Measuring range -50°C +150°C. Resolution 0,1°C. Analog output 4...20mA.
4mA correspond to -20°C, 20mA correspond to +80°C.
Hysteresis 0,8...6°C. Relays 5A 220V resistive. Power supply 24Vac/dc, on request 110….230Vac/dc.

This is a temperature controller thermostat
regulator with an analog output and an ON/OFF
relay output. 
The analog output is in current
4 ... 20 mA (4 mA -L -20oC, 20 mA = +80°C). 

The setting of the intervention temperature
(set point) is carried out by pressing the button on
the left of the front panel of the instrument and
turning the knob on the right until the temperature
at which the relay contact is to open is shown on
the display. Intervention hysteresis may be
adjusted with a trimmer at the rear of the
instrument. 

The temperature sensor is a Pt100. 
If it is connected with 2 wires with a section of 1 mm2, a reading in excess of 0.06°C/m is obtained. 
In order to cut down error a three-wire connection is advised, with the third wire connected to terminal 2. 
The thermostat may be used either for heating or for cooling, simply by moving the jumper at the rear of the instrument. 

When the jumper is in HEATING position, the relay is energized if the probe temperature is lower than the set temperature; when the jumper is in COOLING position, the relay is energized if the probe temperature is higher than the set temperature.

Using range: -50...+150°C
Resolution: 0.1°C
Display: LED, height 12.7 mm
Precision: 0.2°C ±0. 1 % of reading + probe tolerance
Connection: with two or three wires
Power supply: 12÷24 V= 3VA

Outputs: relay contact 3A/220 VAC resistive analog output: 4 mA=-20°C, 20mA=+80°C
Hysteresis: 0.7 ... 6°C
Working temperature: -5...+50°C
Dimensions: front panel 78 x 48 mm instrument body 72 x 42 x 78 m